Overall Green alert Tropical Cyclone for ILSA-23
in Australia

Event summary

Tropical Cyclone ILSA-23 can have a low humanitarian impact based on the maximum sustained wind speed, exposed population and vulnerability.

GDACS ID TC 1000968
Name ILSA-23
From - To 08 Apr - 13 Apr
Exposed countries Australia
Exposed population 3 thousand in Category 1 or higher
Maximum wind speed 241 km/h Category 4
Maximum storm surge 0.7 m (08 Apr 23:00 UTC)
Vulnerability Low (Australia)

GDACS Score

For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS JTWC 213 km/h 0.7 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 252 km/h 2.5 m 582 mm 0.5
GFS 223 km/h 1.9 m 813 mm 0.5
ECMWF 148 km/h 0.7 m 608 mm 0.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
Australia - Tropical Cyclone ILSA, update (ECHO 13 Apr 2023)Thu, 13 Apr 2023 10:05

  • The Bureau of Meteorology upgraded cyclone Ilsa to category 4 with gusts near the centre up to 230km/h as it tracks towards the coast 290km north of Port Hedland at 00:00 UTC 13 April.

  • Winds in Ilsa's "very destructive core" could gust up to 275 km/h with very heavy rains (up to 400 mm) and abnormally high tides on Thursday night into Friday morning local time, before the storm moves inland, over the East Pilbara Shire and the Northern Interior District (Pilbara Region), on 14 April, weakening into a tropical storm.

  • A yellow cyclone alert is in place along more than 700km of coastline between an area south of Broome and Whim Creek, while residents in the populated mining town of Port Hedland are preparing to head into lockdown.

  • Over the next 36 hours, very heavy rainfall, strong winds and storm surge are forecast over the western and central Pilbara Region. The Bureau of Meteorology (BOM) has issued a warning zone for gales over this area.

ILSA-23 - EC/ECHO daily mapThu, 13 Apr 2023 17:56

A new EC/ECHO daily map is now available
Australia - Tropical Cyclone ILSA, update (ECHO 14 Apr 2023)Fri, 14 Apr 2023 10:24

  • Tropical Cyclone ILSA has been downgraded to Category-3 after it crossed the Western Australian coast as a category-5 between De Grey and Pardoo at 16:00 UTC on Thursday, 13 April with a wind speed of 213 km/h.
  • At 1:00 UTC today (14 April), the system has further weakened to Category 2 and is located near Telfer in the far eastern Pilbara, according to the Australian Bureau of Meteorology. ILSA is expected to weaken below tropical cyclone strength tonight and then move into southern parts of the Northern Territory on Saturday morning.
  • Initial reports indicate the cyclone largely missed highly populated areas but brought down trees and caused severe damage to vegetation, along with a storm surge up to six metres high. There have so far been no reports of injuries to people or damage to infrastructure due to the cyclone.
Detailed event map. European Union, 2024. Map produced by EC-JRC.
The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.

Updates on volcanic activity (Smithsonian)

Latest media headlines

Rapport du GIEC 2023 – Risques de catastrophes 4/16/2023 9:42:00 AM.

Le changement climatique a réduit la sécurité alimentaire (A.4). Environ la moitié de la population mondiale connaît actuellement des graves pénuries d’eau. Environ 3,3 à 3,6 milliards de personnes vivent dans des zones très vulnérables au
...(more)
L’Australie-Occidentale évalue la “voie de destruction” du cyclone Ils.. 4/15/2023 10:17:00 PM.

SYDNEY, 15 avril (Reuters) – Les autorités d’urgence d’Australie-Occidentale évaluaient samedi les dégâts causés par un cyclone tropical qui a frappé le nord-ouest de l’État, épargnant des zones fortement peuplées mais affectant plusieurs c
...(more)
Un cyclone d’une vitesse record frappe l’Australie 4/15/2023 8:35:00 AM.

Un cyclone tropical a frappé le nord-ouest de l’Australie vendredi (14), provoquant les vents les plus forts jamais enregistrés à la suite de ce phénomène dans cette région. Les autorités locales ont affirmé que les villes et villages régio
...(more)
Australie : un cyclone très violent est passé au nord-ouest nouvelle c.. 4/15/2023 6:44:00 AM.

C’est un cyclone d’une violence extrême qui a touché le village de Pardoo et ses alentours au nord-ouest de l’Australie, ce vendredi 14 avril. Ilsa, cyclone de catégorie 5, accompagné de rafales à 288 km/h a provoqué d’importants dégâts mai
...(more)

View more news

Estimated casualties (PAGER)

USGS estimates the number of casualties for each earthquake for the Prompt Assessment of Global Earthquakes for Response (PAGER) product.
The graph shows the current fatalities estimate.

Exposed population

Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (40), (2), WMO (1), INFORM (2),